A PAIR OF HEAVY DUTY FULL EXTENSION ACCURIDE 20" LONG DRAWER GLIDES- PART NO. C3037-20D. THEY EXTEND OUT TO 40". THESE ARE UNUSED AND HAVE BEEN SITTING IN THEIR PACKAGE SINCE ABOUT 1980. I BOUGHT A NUMBER OF PAIRS OF THESE GLIDES WHEN I BUILT THE CABINETS FOR MY KITCHEN. HAVE BEEN USING THEM FOR OVER 40 YEARS WITH THE DRAWERS LOADED DOWN WITH DISHES AND HAVE NEVER HAD ANY PROBLEMS.